Tour guide stand by infront of The Golden Place (Tha Chang Pier Branch) next to the Grand Palace on Maha Rat Road, Bangkok. You can get here by Bangkok Ferry Tha Chang Pier (N9) 1 minute aways by walk to meeting point, By Metro near Mrt. Sanam Chai and 15 Mins walk.
tour will take you back to tha tain pier near Wat Pho